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                # LSET **LSET key index value** 將列表 `key` 下標為 `index` 的元素的值設置為 `value` 。 當 `index` 參數超出范圍,或對一個空列表( `key` 不存在)進行 [LSET](#lset) 時,返回一個錯誤。 關于列表下標的更多信息,請參考 [_LINDEX_](lindex.html#lindex) 命令。 **可用版本:** &gt;= 1.0.0 **時間復雜度:** 對頭元素或尾元素進行 [LSET](#lset) 操作,復雜度為 O(1)。其他情況下,為 O(N), `N` 為列表的長度。 **返回值:** 操作成功返回 `ok` ,否則返回錯誤信息。 ``` # 對空列表(key 不存在)進行 LSET redis> EXISTS list (integer) 0 redis> LSET list 0 item (error) ERR no such key # 對非空列表進行 LSET redis> LPUSH job "cook food" (integer) 1 redis> LRANGE job 0 0 1) "cook food" redis> LSET job 0 "play game" OK redis> LRANGE job 0 0 1) "play game" # index 超出范圍 redis> LLEN list # 列表長度為 1 (integer) 1 redis> LSET list 3 'out of range' (error) ERR index out of range ```
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